feat(Nodeagent): build without nodeagent

[leeeunkoo]

📝 PR Description
build without nodeagent
feat(nodeagent) : build without
This pull request updates the Makefile to remove all references to the agent component from the build, release, clean, install, and uninstall processes. This streamlines the workflow by no longer building, cleaning, or managing the piccolo-agent service.

Build and release process changes:

• Removed cargo build, cargo build --release, and cargo clean commands for src/agent/Cargo.toml, so the agent component is no longer included in these steps.

Service management updates:

• Removed systemctl start piccolo-agent from the install process, so the agent service is no longer started during installation.
• Removed systemctl stop piccolo-agent from the uninstall process, so the agent service is no longer stopped during uninstallation. nodeagent

🔗 Related Issue

🧪 Test Method

✅ Checklist
[✅]